Burlington County Average 1999 NATA Modeled Air Concentrations Compared to Health Benchmarks

Pollutant

Modeled
Air Concentration (ug/m3)

Health
Benchmark (ug/m3)

Risk
Ratio

%
Contribution from

Major Sources

Area
Sources

On-road
Mobile Sources

Nonroad
Mobile Sources

Background

Acetaldehyde

2

0.45

4

3%

5%

54%

9%

28%

Acrolein

0.2

0.020

8

0.5%

36%

49%

14%

0%

Arsenic Compounds

0.0001

0.00023

0.6

69%

31%

0%

0%

0%

Benzene

1

0.13

10

1%

10%

45%

13%

31%

Bis(2-ethylhexyl)phthalate

2

0.42

4

0.001%

0.2%

0%

0%

100%

1,3-Butadiene

0.1

0.033

4

0.08%

12%

32%

12%

44%

Cadmium Compounds

0.00008

0.00024

0.3

57%

42%

0%

0.9%

0%

Carbon Tetrachloride

0.3

0.067

4

0.5%

0.3%

0%

0%

99%

Chloroform

0.1

0.043

2

2%

57%

0%

0%

41%

Chromium (hexavalent form)

0.0001

0.000083

1.7

32%

59%

8%

0.6%

0%

1,4-Dichlorobenzene

0.05

0.091

0.5

0.1%

100%

0%

0%

0%

1,3-Dichloropropene

0.09

0.25

0.4

0.0004%

100%

0%

0%

0%

Diesel Particulate Matter

2

0.0033

545

0%

0%

40%

60%

*

Ethylene Dibromide

0.03

0.0017

15

0.02%

0.004%

0%

0%

100%

Ethylene Dichloride

0.04

0.038

1.1

4%

0.8%

0%

0%

95%

Ethylene Oxide

0.002

0.011

0.2

12%

88%

0%

0%

0%

Formaldehyde

2

0.077

25

0.8%

12%

32%

13%

42%

Methyl Chloride

1

0.56

2

1%

1%

0%

0%

98%

Naphthalene

0.06

0.029

1.9

10%

55%

28%

7%

0%

Nickel Compounds

0.004

0.0064

0.6

53%

41%

1%

4%

0%

Perchloroethylene

0.2

0.17

1

0.8%

35%

0%

0%

64%

1,1,2,2-Tetrachloroethane

0.06

0.017

4

0.6%

0.9%

0%

0%

98%

Chemicals with risk ratios greater than or equal to 1 are
in bold.
Risk Ratios in italics are based on noncarcinogenic effects.
The symbol ug/m3 is micrograms per cubic meter,
the amount (in micrograms) of a chemical in a cubic
meter of air. This is also known as a concentration.
* For diesel particulate matter, onroad and nonroad
concentrations include a model-estimated background
concentration.